An infinite impulse response equalizer for magnetic recording channels

Abstract

In this paper, we propose a method of designing an infinite impulse response (IIR) equalizer used to
shape the readback signal to a partial response target in longitudinal and perpendicular recording channels.
Based on the minimum mean-squared error (MMSE), the coefficients of the IIR equalizer are explicitly
derived. For both recording channels, the proposed IIR equalizer performs better than the finite impulse
response (FIR) equalizer, especially when the number of equalizer taps is small and the normalized recording
density is high.